diff --git a/block/internal/syncing/da_retriever.go b/block/internal/syncing/da_retriever.go
index f1ea3ba64..6d5a7929a 100644
--- a/block/internal/syncing/da_retriever.go
+++ b/block/internal/syncing/da_retriever.go
@@ -289,7 +289,7 @@ func (r *daRetriever) tryDecodeHeader(bz []byte, daHeight uint64) *types.SignedH
 		}
 	}
 	if r.strictMode && !isValidEnvelope {
-		r.logger.Warn().Msg("strict mode: rejecting block that is not a fully valid envelope")
+		r.logger.Warn().Uint64("da_height", daHeight).Msg("strict mode: rejecting block that is not a fully valid envelope")
 		return nil
 	}
 
@@ -304,7 +304,7 @@ func (r *daRetriever) tryDecodeHeader(bz []byte, daHeight uint64) *types.SignedH
 	}
 
 	if isValidEnvelope && !r.strictMode {
-		r.logger.Info().Uint64("height", header.Height()).Msg("valid DA envelope detected, switching to STRICT MODE")
+		r.logger.Info().Uint64("height", header.Height()).Uint64("da_height", daHeight).Msg("valid DA envelope detected, switching to STRICT MODE")
 		r.strictMode = true
 	}
 
diff --git a/pkg/da/jsonrpc/header.go b/pkg/da/jsonrpc/header.go
index abcc2784a..0b6e0f08d 100644
--- a/pkg/da/jsonrpc/header.go
+++ b/pkg/da/jsonrpc/header.go
@@ -20,13 +20,13 @@ type Header struct {
 // RawHeader contains the raw tendermint header fields.
 type RawHeader struct {
 	ChainID string    `json:"chain_id"`
-	Height  string    `json:"height"`
+	Height  uint64    `json:"height"`
 	Time    time.Time `json:"time"`
 }
 
 // Commit contains commit information.
 type Commit struct {
-	Height string `json:"height"`
+	Height uint64 `json:"height"`
 }
 
 // DAHeader contains the Data Availability header.
diff --git a/types/serialization.go b/types/serialization.go
index b304b61fb..4bec69c00 100644
--- a/types/serialization.go
+++ b/types/serialization.go
@@ -522,11 +522,6 @@ const (
 	legacyLastResultsHashField = 9
 )
 
-// Maximum size of unknown fields to prevent DoS attacks via malicious headers
-// with excessive unknown field data. 1MB should be more than sufficient for
-// legitimate legacy headers (typical header is ~500 bytes).
-const maxUnknownFieldSize = 1024 * 1024 // 1MB
-
 // Maximum size for individual legacy hash fields. Standard hashes are 32 bytes,
 // but we allow up to 1KB for flexibility with different hash algorithms.
 const maxLegacyHashSize = 1024 // 1KB
@@ -537,13 +532,7 @@ func decodeLegacyHeaderFields(pHeader *pb.Header) (*LegacyHeaderFields, error) {
 		return nil, nil
 	}
 
-	// Protect against DoS attacks via headers with massive unknown field data
-	if len(unknown) > maxUnknownFieldSize {
-		return nil, fmt.Errorf("unknown fields too large: %d bytes (max %d)", len(unknown), maxUnknownFieldSize)
-	}
-
 	var legacy LegacyHeaderFields
-
 	for len(unknown) > 0 {
 		fieldNum, typ, n := protowire.ConsumeTag(unknown)
 		if n < 0 {